/* 基础样式 */
body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
  }
  
  a {
    color: #3490dc;
    text-decoration: none;
    transition: color 0.2s;
  }
  
  a:hover {
    color: #1c68c0;
    text-decoration: none;
  }
  
  /* 工具类 */
  .text-center {
    text-align: center;
  }
  
  .mt-5 {
    margin-top: 3rem;
  }
  
  .mb-5 {
    margin-bottom: 3rem;
  }
  
  .py-5 {
    padding-top: 3rem;
    padding-bottom: 3rem;
  }
  
  /* 卡片样式 */
  .card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
  }
  
  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }
  
  /* 按钮样式 */
  .btn {
    border-radius: 4px;
    padding: 8px 20px;
    font-weight: 500;
    transition: all 0.2s;
  }
  
  .btn-primary {
    background-color: #3490dc;
    border-color: #3490dc;
  }
  
  .btn-primary:hover {
    background-color: #227dc7;
    border-color: #227dc7;
  }
  
  /* 表单样式 */
  .form-control {
    border-radius: 4px;
    padding: 10px 15px;
    border: 1px solid #ddd;
  }
  
  .form-control:focus {
    border-color: #3490dc;
    box-shadow: 0 0 0 0.2rem rgba(52, 144, 220, 0.25);
  }
  
  /* 响应式图片 */
  .img-fluid {
    max-width: 100%;
    height: auto;
  }
  
  /* 面包屑导航 */
  .breadcrumb {
    background-color: transparent;
    padding: 0.75rem 0;
    margin-bottom: 0;
  }
  
  .breadcrumb-item + .breadcrumb-item::before {
    content: ">";
  }